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DoD Hearing Technician_ Chapter Five - Audiometric Testing & Follow-up
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DoD Hearing Technician_ Chapter Five - Audiometric Testing & Follow-up
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DoD Hearing Technician: Chapter Five -Audiometric Testing & Follow-up
What is the threshold of hearing?
The lowest level of sound a person can hear in a series of ascending, pure tone presentation
trials at least 50% of the time
What is the audiometric zero?
The sound pressure level at which the threshold of audibility occurs for average normal
listeners
What is an audiogram?
o A record of and individuals hearing sensitivity.
o For occupational testing, a record of the pure-tone air-conducting hearing threshold levels
What is significant threshold (STS)?
An average change of plus or minus 10 dB at 2000, 3000, and 4000 Hz, relative to the
reference audiogram, in either ear, relative to the baseline audiogram, without age
corrections (DoDI 6055.12)
What is temporary threshold (TTS)?
An STS that resolves on follow-up test after auditory rest ( ≥14 hours)
What is permanent threshold shift (PTS)?
o An STS that doesn’t resolve on follow-up testing after auditory rest (≥14 hours)
o Confirmed by an audiologist or physician (Professional Supervisor)
, What is the purpose pf audiometric testing?
o Comply with Federal, DoD and Service-specific regulations
o Monitor the effectiveness of the local hearing program
o Identify significant threshold shifts
o Ensure proper medical referrals and diagnoses
o Establish individual fitness for duty
What types of graphic audiogram recordings are there?
o Graphic representation of hearing thresholds
o Frequency and intensity
o Symbols to represent right ear, left ear, air conduction, bone conduction and masked
thresholds
(legend)
o Frequently used in a clinical/diagnostic setting
What types of serial/numeric audiogram recordings?
o Thresholds are measured and recorded in 5 dB increments
o Used on DD 2215, DD 2216 and non-hearing conservation tests
What are the degrees of hearing loss?
o Normal
o Mild
o Moderate
o Moderately severe
o Severe
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